Deep Drilling on Midway Atoll
Deep Drilling on Midway Atoll GEOLOGICAL SURVEY PROFESSIONAL PAPER 680-A Deep Drilling on Midway Atoll By HARRY S. LADD, JOSHUA I. TRACEY, JR., and M. GRANT GROSS GEOLOGY OF THE MIDWAY AREA, HAWAIIAN ISLANDS GEOLOGICAL SURVEY PROFESSIONAL PAPER 680-A Two cores recovered from the reef cap and the basaltic foundation establish a Tertiary section for the Hawaiian Islands UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1970 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price $1 (paper cover) DEEP DRILLING ON MIDWAY ATOLL The windward reef, Kure. The irregular red-brown buttresses, composed of living algae, are bordered to seaward by irregular submarine grooves and ridges; the reef flat, built of corals and algae (right), extends toward the lagoon. CONTENTS Page Page Abstract._______________________________ Al Lithology of the sedimentary section________---_-_____ A8 Introduction. ___________________________ 1 Organic composition and age of the sedimentary section- 14 Regional relations ____________________ 2 Basaltic foundation.___________________-_--__---_-__ 18 Location. ___________________________ 4 Comparable reef drilling elsewhere.___________________ 18 Acknowledgments.----... ____________ 4 Geologic history of Midway_______-____-------_--_-_- 20 Equipment, supplies, and personnel._______ 5 References cited.______________-_____---_-_--_--_--_ 21 Operations----____-_--_______-__________ 7 Drilling. ____________________________ 7 Tests before, during, and after drilling-_ 7 ILLUSTRATIONS Frontispiece. The windward reef, Kure. f&ge PLATE 1. Bathymetric chart of Midway area_____--______--_--__________________________________________ In pocket FIGURE 1. Index map of the Hawaiian chain_____________________________________----____-_-_---_----_-______ A2 2.
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